300W 12VDC Class 2 type Triac dimmable 100-277VAC constant voltage LED Power Supply driver + PWM signal output




300W 12VDC Class 2 type Triac dimmable 100-277VAC constant voltage LED Power Supply driver + PWM signal output, MRS-12V300W-DVTHJ


  • Output constant voltage
  • Input voltage range: 100-277VAC
  • Built-in PFC function / PF>0.99
  • Efficiency >89% / Dimming range: 0~100% / Load: 10-100%
  • Protections:short circuit/over voltage/over heat
  • PWM output, does not change the color index
  • 1.0 version suitable for dry & damp location
  • 2.0 & 3.0 version suitable for dry, damp & wet location
  • Cooling by free air convection
  • Strong compatibility, flicker-free, PWM output
  • Suitable for LED lighting and moving sign applications
  • Compliance to worldwide safety regulations for lightings.
  • Compatible with Forward phase, Reverse phase, Triac, MLV, ELV Dimmers
  • 7 years warranty


Model MRS-12V300W-DVTHJ(1.0 Version)
Output DC Voltage 12V
Voltage Tolerance ±0.5V
Voltage Regulation ±0.5%
Voltage Tolerance ±0.5V
Load Regulation ±2%
Rated current 25A (multi current 5*5A)
Rated power  300W (5*60W)
Input Voltage Range 100-277VAC
Frequency Range 47~63HZ
Power Factor (Typ.)@full load 0.95@120VAC  0.95@277VAC
THD(Typ.)@full load <20%
Inrush Current(Typ.) 35A (twidth=960us) @120VAC ;  43A (twidth=1ms) @277VAC 
Efficiency(Typ.)@Full Load  85%@120VAC   90%@277VAC
AC Current(Typ.) 3.6A@100VAC
Leakage current <0.50mA
Protection  Short Circuit shut down o/p voltage, re-power on to recover after fault condition is removed
Over load ≤120% constant current limiting, auto-recovery
Over temperature 100℃±10℃ shut down o/p voltage, automatically recover after cooling.
Over Current ≤1.4*I out
Environment Working TEMP. -40~+60℃
Working Humidity  20~90%RH,non-condensing
Storage TEM.,Humidity -40~+80℃,10~95%RH
TEMP.coefficient ±0.03%/℃(0~50℃)
Vibration 10~500Hz 2G 10min./1 cycle,period for 60min.each along X,
Y,Z axes
  Safety standards UL8750+UL1310
  Withstand voltage I/P-O/P:1.88KVAC  
  Isolation resistance I/P-O/P:100MΩ/500VDC/25℃/70%RH
  EMC IMMUNITY  EN61000-4-2,3,4,5,6,11(Surge 4KV)
Others Weight 2.4Kg  
Size 1.0 version:   301*108*46mm (L*W*H)  / 2.0 version:  301*110*45mm
3.0 version:  301*140*45mm 
packaging 365*210*245mm/8pcs /CTN    G.W.:21KG/CTN
385*335*200mm     20PCS/CTN
Notes 1. All parameters NOT specially mentioned are measured at 110V & 277VAC input , rated load 
and 25℃of ambient temperature.   
2..Tolerance:includes set us tolerance,line regulation and load regulation.   

※Input:18AWG Black and White to be connected to AC L and N ,Green wire go ground,

※Output wire: 16AWG ,  Red is(DIM+),Black is(DIM-)

※Class 2 standard output terminal. 

Dimming Operation

※The Pulse-Width Modulation (PWM) of output voltage can be adjusted through input terminal of the AC phase line(L) by connection a phase/triac dimmer.

※Usually matching with Forward phase , leading edge , Magnetic low voltage, triac dimmers, or Reverse phase, trailing edge ,Electric low voltage Dimmers. 

※Please try to use dimmers with power at least 1.5 times as the output power of the driver.

■Derating Curve


■ Connecting Diagram



Simple Connection Diagram:


※This driver should be installed by qualified and professional person;

※Please make sure the driver is installed with adequate ventilation around it to allow for heat dissipation.

※Ensure that wiring is correct before test in order to avoid light and power supply damage;

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